Syringe



Nav. s, 192,7.

R. E. KLETT SYRINGE Filed Aug. 16, 1923 IN VEN TOR m."

lBY

AToRNEY 'u airis y rar ROBERT E. KLETT, os anearrnnnmarz, new?`assi-snortro 'nr-ETT Manej- FACTURING COMPANY; me., or New Yoan; N.'A'coaronamron or Nswyoam emmen..

' i Apinication med August 16,. ieee.; serial Nei 55mm-g wf Thisinvention relates to syringes such as are used for hypodermicinjections, andother similar devices which require sterilization.Difficulty has beenexperienced in obtaining a suitable piston and endplug for such syringes. Metal is subject to excessive wear underpro-longed use, and if combined with a glass cylinder is liable tostick, or break the glass'if the syringe be sterilized without taking itapart. .Glass and porcelain are not convenient because these substancesare not capable of receiving screw threads by means of 4which the pistonrod orv other member may be connected, and are also too brittle.

An object of this invention is to provide a hard, substantiallyheat-resisting, and nonexpansible material which may be us-ed within aglass or other syringe barrel and lpossess'a long life adapted towithstand hard wear, being not brittle and capable of having the syringesterilized without the necessity of taking it apart.

The drawing shows a longitudinal section of this invention embodied in asyringe.V

The hypodermic needle 10 is supported by the metal end member 11 in thecustomary The barrel --13 of the syringe is preferably of ground glassand has the plug 15 of lava in one end thereof which plug is providedwith screw threads 14 to engage the member 11 and as shown a flange 12may engage the ends of the barrel. .Within the barrel is the piston 16also of lava and having threaded engagement with the metal V member 17which is connected to the piston rod 18 through the ball andsocket/joint 19. Customary linger grips 2O are provided on the barrel ofthe syringe andv likewisethe usual support 21 for Vthe actuating thumbor finger. Surrounding the glassbarrel isthe vmetal casing 22 which isprovided to safeguard the barrel and prevent breakage. The

metal casing is preferably open on opposite y glass barrel of a hard,substantially heatsides to permit transmission of light through thesyringe and to enable graduations to be provided on the glassbarrel.

VThe lava of which end member 15 and piston 16V are constructed is notof volcanic origin but is the magnesia and talc compound met with in theelectric arts asian insulating and heat resisting material lwhich ismined as a soft materialenabling it'to be machined or threaded asdesired. A subsequent baking operation wherein the material fromliterature is subjected to a temperature of about 2,000o F. changes itinto a very hard substance which though hard is not as brittle as. glassor porcelain. A more detailed description of this material and itscharacteristics may beV found on pages 81484 of a book entitled CommonMaterials published for Elec- Y 'trical Record by The Gage'PublishingCo.1

Inc., 114 Liberty Street, New York city, or

Lava Company.

published by the American' There are a number of'advantages ac-` cruingfrom making a piston or other memberinside a "syringe of lava.y Thismaterial is heat resistantv and because substantially non-expansible, itis possible to sterilize the syringe without taking it apart. .The lavabeing less brittle, yethard, and in its soft statebefore baking adaptedto be machined, makes'this materialk better adapted forsuch usethanglass or porcelain because these materials cannot kbe satisfactorilythreaded.v The lava d oesnot cut or scratch the walls of the glass'barrel but instead, after pro- V f longed use, becomes polished. Ifmetal pistons were used theywould be subject to the disadvantage ofundue wear and expansion when heated during sterilization, requiring thedemounting of the syringe when a metal piston is used. v

The lava'material is adapted for other locations than pistons and forvuse in other devices requiring sterilization 'than the syringeillustrated.

I claim: 1.,The combination with a barrehof a hard, substantially.heat-resistant, and noneXpans'ible piston therein less brittle than thebarrel and adapted vto take a polish with use, anda piston rod securedto said piston. 2. The combination with a barrel, of a lava pistonmovable therein, and a piston rod secured to the piston.

3. In a syringe, the combination with a resistant and non-eXpansiblepiston therein capable oftaking ar polish on its periphery underprolonged use, and a piston rod vcontaeting with the inner Walle of saidbarrel. joint between said piston rod and member. 10

6. The combination with a glass barrel, .8@ The combination with a;barrel, of a of apiston therein composed of lava havlava piston therein,a piston rod, and a lava ing e polished surface eontaeting with the plugolosingran end of the barrel and having 5 barrel,` a piston rod, and athreaded cona hole therethrough. f nection between said piston and rod.Signed at New York city. in theA county 15 7. The combination with aglass barrel, of. 'of New York and State of New York, thisV a .lavapiston therein, a member threaded to 14th day of August, A. D. 1923.

,f the piston, a piston rod, and a universal ROBERT E. KLETT.

